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13b
I am probably an older Mazda tech than your dad. I can assure them both that the RX4 had a 13B in the 1974 model year in the US. The engine was significantly changed in 1976. The 13B was used all models of US RX4's as well as the Cosmo and Rotary Pickup. Took a few years off from the US and reappeared in the 1984 model year in certain RX7 models.
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